[Wrf-users] very cold bias in 3.8.1

[Dominikus Heinzeller]

Hi Kostas,

Sorry for the late reply. Are you aware of the following bug (with an easy fix) in WRFV3.7 and later?

http://www2.mmm.ucar.edu/wrf/users/wrfv3.8/known-prob-3.8.1.html <http://www2.mmm.ucar.edu/wrf/users/wrfv3.8/known-prob-3.8.1.html> 

Seems this might be hurting you.

Cheers

Dom

> On 2/11/2016, at 10:56 AM, kostas markakis <konstantinos.markakis at lmd.polytechnique.fr> wrote:
> 
> Good morning to everyone,
> 
> I am experiencing a strange behaviour of a very cold temperature bias when using WRF 3.8.1 (em_real case). I have run the same simulation with version 3.6.1 and i am getting a bias of -1o Celsius. With 3.8.1 i get -7. Has anyone had similar behaviour? I attach my namelist. My domain is the area around Paris, France the topography is relatively flat, away from coastal areas. I am using the BEP urban model. I have tried additionally 2 configurations (changing some schemes with no urban model) only with 3.8.1 and i always get a very cold bias in the order of -5,-6.
> 
> I have to note two things:
> 
> 1) with the 3.8.1 version i get this strange message in metgrid:
> 
> "Note: The following floating-point exceptions are signalling: IEEE_OVERFLOW_FLAG IEEE_UNDERFLOW_FLAG IEEE_DENORMAL"
> 
> 2) i never managed to compile WRF3.8.1 with the default flags in configure.wrf. In order to work i had to include several new flags (i attach my configure.wrf)
> 
> Thanks in advance
> 
> -- 
> 
> Konstantinos Markakis
> Post-doctoral researcher
> LMD (Laboratoire de Meteorologie Dynamique), IPSL
> Université Pierre et Marie Curie, 4 Place Jussieu
> e-mail: konstantinos.markakis at lmd.polytechnique.fr
> 
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